Meaning
A fist seen from the side, punching toward the left. Literally it is a fist pointed leftward.
It is usually half of a fist bump, paired with 🤜 to show two people knocking knuckles in agreement or celebration. Alone it can mean “bump it” or a playful jab. Skin-tone versions are available. Example: “We finally finished the group project 🤛🤜”.